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On the center conditions for analytic monodromic degenerate singularities
(World Scientific Publishing, 2012)In this paper we present two methods for detecting centers of monodromic degenerate singularities of planar analytic vector fields. These methods use auxiliary symmetric vector fields can be applied independently that the ... 
On the compositional analysis of fatty acids in pork
(International Biometric Society, 20140301)Fatty acid (FA) composition of pork is an important issue for the pig industry and consumers. Fatty acid composition is commonly described as the percentages of a set of FA relative to total FA and therefore should be ... 
On the conceptualization, design and evaluation of appealing, meaningful, and playable digital games for older people
(SAGE Publications, 20150730)While older people tend to be regarded as actual, or potential, players of digital games within literature on game studies, human<br>computer interaction, and ger ontechnology, they are also often considered nonavid users ... 
On the evocative power and play value of a wearable movementtosound interaction accessory in the rich freeplay of schoolchildren
(IOS Press, 2014)This paper discusses the evocative power and play value of the Wearable Sounds Kit (WSK), a movementtosound interaction accessory. Whilst movementtosound interaction is attracting growing research attention in HCI, ... 
On the evolution of afrobolivian spanish subject verb agreement: variation and change
(Sintagma: revista de lingüística, 20090101) 
On the extensions of the Darboux theory of integrability
(IOP Publishing, 2013)Recently some extensions of the classical Darboux integrability theory to autonomous and nonautonomous polynomial vector fields were completed. The classical Darboux integrability theory and its recent extensions are based ... 
On the Formal Integrability Problem for Planar Differential Systems
(Hindawi Publishing Corporation, 2013)We study the analytic integrability problem through the formal integrability problem and we show its connection, in some cases, with the existence of invariant analytic (sometimes algebraic) curves. From the results ... 
On the hardness of solving edge matching puzzles as SAT or CSP problems
(Springer Verlag, 2013)Edge matching puzzles have been amongst us for a long time now and traditionally they have been considered, both, a children’s game and an interesting mathematical divertimento. Their main characteristics have already been ... 
On the Integrability of Liénard systems with a strong saddle
(Elsevier, 2017)We study the local analytic integrability for real Li\'{e}nard systems, $\dot x=yF(x),$ $\dot y= x$, with $F(0)=0$ but $F'(0)\ne0,$ which implies that it has a strong saddle at the origin. First we prove that this problem ... 
On the multiple zeros of a real analytic function with applications to the averaging theory of differential equations
(IOP Publishing, 20181121)In this work we consider real analytic functions $d(z,\la,\e)$, where $d : \Omega \times \mathbb{R}^p \times I \to \Omega$, $\Omega$ is a bounded open subset of $\R$, $I \subset \mathbb{R}$ is an interval containing the ... 
On the origin of the deflection of light
(Elsevier, 2008)Action at distance in Newtonian physics is replaced by finite propagation speeds in classical post–Newtonian physics. As a result, the differential equations of motion in Newtonian physics are replaced by functional ... 
On the origin of the inertia: the modified Newtonian dynamics theory
(Elsevier, 2009)The sameness between the inertial mass and the gravitational mass is an assumption and not a consequence of the equivalent principle is shown. In the context of the Sciama’s inertia theory, the sameness between the inertial ... 
On the Origins of Crusading in the Peninsula: the Reign of Alfonso VI (10651109)
(Universitat de Lleida, 2013) 
On the Performance of MaxSAT and MinSAT Solvers on 2SATMaxOnes
(Springer International Publishing Switzerland, 20160601)We analyze and compare two solvers for Boolean optimization problems: WMaxSatz, a solver for Partial MaxSAT, and MinSatz, a solver for Partial MinSAT. Both MaxSAT and MinSAT are similar, but previous results indicate that ... 
On the periodic orbit bifurcating from a Hopf bifurcation in systems with two slow and one fast variables
(Elsevier, 2014)The Hopf bifurcation in slowfast systems with two slow variables and one fast variable has been studied recently, mainly from a numerical point of view. Our goal is to provide an analytic proof of the existence of the ... 
On the planar integrable differential systems
(Springer Verlag, 2011)Under very general assumptions we prove that the planar differential systems having a first integral are essentially the linear differential systems u˙ = u, ˙v = v. Additionally such systems always have a Lie symmetry. We ... 
On the Randić index of graphs
(Elsevier, 20180911)For a given graph G = (V, E), the degree mean rate of an edge uv ∈ E is a half of the quotient between the geometric and arithmetic means of its endvertex degrees d(u) and d(v). In this note, we derive tight bounds for ... 
On the social and linguistic implications of unstressed vowel weakening in cochabambino spanish
(Sintagma: revista de lingüística, 2013) 
On the status of the phoneme /b/ in heritage speakers of spanish
(Sintagma: revista de lingüística, 2014) 
On the term Albigensians in 13th Century Hispanic Sources
(Universitat de Lleida, 20090101)